Made from Aluminum Sheet with Double Seam, our G-Flow Exhaust Duct products are specially created to prevent leaks, be flexible and light for easy implementation. Able to withstand temperatures of 250 degrees Celsius and stretch up to 2.5 times its minimum length. Most suited for complete ventilation systems according to your specific requirements.                     Pipe size range: 4, 5, 6 inches. Pipe Length range: 1, 2, 3 metres         1 Exhaust Fan ( พัดลมดูดอากาศ)     2.Exhaust Duct ( ท่อ G-Flow )     3.Exhaust Grill ( หน้ากาก G -Flow )     How-to-Use illustrations of Exhaust Duct and Exhaust Grill.